KMID : 0624620110440040262
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BMB Reports 2011 Volume.44 No. 4 p.262 ~ p.266
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Identification of strain harboring both aac(6')-Ib and aac(6')-Ib-cr variant simultaneously in Escherichia coli and Klebsiella pneumoniae
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Kim Yun-Tae
Jang Ji-Hyun Kim Hyun-Chul Kim Hyo-Gyeong Lee Kyoung-Ryul Park Kyung-Sun Lee Hee-Joo Kim Young-Jin
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Abstract
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The aac(6')-Ib gene is the most prevalent gene that encodes aminoglycoside-modifying enzymes and confers resistance to tobramycin, kanamycin, and amikacin. The aac(6')-Ib-cr variant gene can induce resistance against aminoglycoside and fluoroquinolone simultaneously. Two main methods, sequence analysis and the restriction enzyme method, can detect the aac(6')-Ib-cr variant in clinical strains. We collected the 85 strains that were believed to be aac(6')-Ib positive from clinical isolates. Among them, 38 strains were the wild-type; the remaining 47 strains were the aac(6')-Ib-cr variant. Of these 47 strains, 19 simultaneously harbored aac(6')-Ib and aac(6')-Ib-cr. Our study aims to report the characteristics of the 19 strains that simultaneously harbored both genes. This study is the first investigation published in Korea of strains that included both aac(6')-Ib and aac(6')-Ib-cr variant.
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KEYWORD
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aac(6')-Ib, aac(6')-Ib-cr, DHPLC, Restriction enzyme, Sequence analysis
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